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Subtransit takes place in a large map with a train that can be used by the players.
 Behind the scenes
- The map was possible meant to be used as a cooperative map. There are nodes scattered around the map, which are used by characters for navigation. They were most likely to be used by the Marines seen in the early screenshots of the map. Cooperative specific starting points for players (info_player_coop) can be also found in the map. Picking up the RPG was to trigger a scripted event called "rpggrunts". Four marines were to run to the area with the tracks.
- The name of the map is "hlmp1" in the leaked Half-Life: Source map pack (hl-wc-maps). This may be the original title of the map. Unlike other multiplayer maps, it doesn't use "dm" (deathmatch) prefix in its filename.
- Dario Casali's signature can be found in the map using the noclip mode.
- The train was originally created for the abandoned rail system section of Blast Pit.